Furnace



May 8, 1928. 1,668,585 J; CUSTER FURNACE Fil ed Au 17. 1926 Patented May 8, 1928.

siren srA-ras JOHN GUSTER, OF DETROIT, MICHIGAN.

rUnNAcE.

Application filed August 17, 1926. Serial No. 129,690.

lily invention relates to a new and useful improvement in a furnace, and has for its object the provision of a furnace in which a maxin'iuin amount of heating surface is atfordedin 'nopor'tion to the size of the grates used.

Another object of the invention is the provision of "a furnace in which the draft will be directed downwardly through the combust' mg i'ucl and thence outwardly through the flue.

Another object of the invention is the provision of a furnace in which the gases are retarded in'their passage from the furhace to "the outlet flue and in which a thorough mixing of the gases with air is etlected for completing to the maximum the combustion oi the gases.

irnother object of the invention is the provision of a furnace, in which the draft on the furnace is reduced to a minimum, thus effecting a retarding while at the same time also completely combusting the gases from the fuel.

Another object of the invention is the provision in a furnace of an auxiliary fire box in which partially burned fuel deposited therein from the main. lire box may continue to burn, thus resulting in an economy of fuel consumption.

Another object of the invention is the pro vision of a furnace which will be simple in structure, economical of manufacture, and highly efficient in use and quite economical in fuel consumption.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts. hereinafter described and claimed. The invention will be best understood by a reference to the accompanying drawings which form a part of this application and in which,

Fig. 1 is a central vertical sectional view of the invention.

Fig. 2 is a front elevational view of the in vention. i v

Fig. 3 is a side elevationalview oi the invention with parts broken away and parts shown in section.

Fig. l is a sectional view taken on sub stantially line 4- of Fig. 3.

Fig. 5 is a sectional View taken on substantiallyline 5 5 of Fig. 3 with parts broken away.

The furnace comprises a housing or casing having outer side Walls 8 and 9, an outer rear wall '10, and inner side walls 11 and12 connected by an inner rear wall 13. The sidewalls 8 and 11 are connected b'y'a front wall. portion Li and the side walls 9 and 12 are connected by a front wall portion 15, the inner side walls and the inner rear wall being spaced from the outer side walls and the outer rear wall respectively. A top wall provided aiportion of which inclines upwardly to the front as shown at 16, an inclined door 17 being mounted thereon for closing the space between the edge of the upperwall 16 and the front wall. A ventilating slide 18 is provided in the door 17 for opening and closing the openings 19 so as to regulate the admission of air into the furnace. Mounted between the front wall and the auxiliary rear wall 13fis an upper grate 20 upon which the fuel is deposited through the door 17. Formed in the side walls 11 and 12 are openings 21 which are formed by punching inwardly a portion of the side walls 11 and 12 as shown in Fig. 5. -Mounted between the side walls 8 and 11 and be tween the side walls 9 and 12 are channel irons 22 and 23 respectively which are formed arcuate as clearly shown in Figs. land 3 in clined forwardly and upwardly. Projecting upwardly from the base 2e is a partition 25 connected by the plate 26to the wall 13. Mounted on the forward wall of the casing and on the partition 25 is a lower or auxil iary grate 27. A stoker door 28 serves as a closure for the opening 29 formed in the front wall. A door 30 serves as a'closure for the opening 81 formed in the front walland a door 32 serves as a closure for the opening formed in the front wall this opening being positioned slightly above the baseeor bottom 24. The grates are all of the/rockable type but since these grates of themselves tor-1n no specific part of the present inven tion they are not. shown in detail. The up: per grate 20 is mountedjon adownwardly projecting portion 34 of abraicket 35 which is 'i'i'ioun'ted on thew all'l il, and the forward end of the grate 20 is journalled in adown wardly projecting portion 36 of a bracket 37 which is mounted on the front'wall or the furnace and which is provided with the lug 38. y p

In operation the fuel is deposited through the door 17 on the grate 20 and there ignited. Communicating with the space between the wall 13 and the rear wall 10 is a pipe or out- III let flue connecting with which is the pipe at), in which is positioned a suitable damper ll. Upon starting the furnace the slide 18 will be moved so as to uncov er theopenings 19, thus permitting air to enter the upper part of the furnace. In starting, the closure 42, which serves to. close the opening "l3 formed in the rear wall 13. will be raised by means of the rod at, which is provided with suitable notches 45, so that the air passing through the door 17 will pass through the fuel on the grate 20, through the opening 43 and thence outwardly through the pipe40. If desired the door 28 may be opened for the admission of more air into the upper part of the furnace. After the fuel on the grate 20 has become ignited the closure l2 is moved to closed position and the air entering through the door 17 will pass downwardly through the fuel on the grate 2t) and through the openings ill into the space between the side walls 8 and 11 and the side walls 9 and 12 being deflected upwardly and forwardly by the channel irons 22 and 23 so as to pass over the ends of these angle irons into the space between the rear walls 10 and 13 and thence outwardly through the pipe l0. In this way the area of the side walls and the rear wall is presented as a heating surface and the gases are retarded in their passage from the furnace by the battling thus provided. The slide 18 may be regulated to admit the desired quantity of air into the furnace, the damper being, of course, open. After the fuel has become well ignited the damper ll ma be closed and experience has shown that when tnis damper ll is entirely closed the space around the periphery of the damper and the opening in its center will he suliicientto permit proper combustion of the fuel and prevent escape of from the turi'iace other than through the line -l-.O.

The location of the gate 27 below the grate 20 is such that unburned fuel falling from the grate 20 is deposited thereon and is permitted to burn further so that complete combustion of the fuel. takes place and the deposit of charred fuel, such as coke and the like in the ash pit, is eliminated.

The provision of the space below the grate 20 and below the grate 27 is such as to effect a thorough commingling of the various gases with effect and with the air admitted so that the maximum combustion is effected and economy in fuel consumption thus obtained.

As shown the furnace is mounted on suitable supports 57 which COIl'lPI'lEQ angle irons for reinforcing the corners of the furnace. Oleanout doors 58 and 59 are provided on the front wall.

The furnace may be used for heating by radiation, hot air, hot water or the like, slight modifications, of course, being necessary from the structure shown in the draw ings in order to accommodate the furnace for steam or hot water heating. 'lhese modifications, however, would be obvious to one skilled in the art and for that reason are not shown.

While I have illustrated and described the preferred form of my invention, I do not wish to limit myself to the precise form of structure shown, but desire to avail myself of such variations and modifications as may come within the scope of the appended claims.

Having thus described my invention what l claim as new and desire to secure by Letters Patent is:

1. A furnace of the class described comprising: an outer casing having side and rear walls; an inner casing having side and rear walls spaced from the side and rear walls of said outer casing; a grate mounted in said inner casing, said inner casing being in communication with the space between said side walls through openings formed in the side walls of said inner casing below said grate, said inner casing having an air inlet p0sitioned above said grate.

2. A furnace of the class described comprising: an outer casing; an inner casing enclosed by said outer casing, the side and rear walls of said inner casing being spaced from the side and rear walls of said outer casing; an outlet flue communicating with the space between said rear walls; battle members mounted in the space between said side walls, said inner casing communicating through openings with the space between said side walls; a grate mounted in said inner casing above said openings, said inner casing having an air inlet opening posi tioned above said grate.

3. A furnace of the class described comprising: an outer casing; an inner casing on closed by said outer casing, the side and rear walls of said inner casing being spaced from the side and rear walls of said outer casing; an outlet i'lue communicating with the space between said rear Waller ballle members mounted in the space between said side walls, said inner casing conununicating through openings with the space between said side walls: a 'ate'i'nountcd in said inner casing above said openings. said inner casing having an air inlet opening positioned above said grate; and an auxiliary grate positioi'ied in said inner casing below said comn'iunicating openings, said auxiliary grate being adapted for reception of fuel falling from said first mentioned grate, said grates being adapted for retention of fuel during combustion.

In testimony whereof I have signed the foregoing.

JOHN CUSTER. 

